she massages you and then you get to massage her.

They were popular in the early 1970's before some cities began trying to control prostitution by enacting licensing requirements for masseuses.

A switch can refer to a type of whip or strap.  

I imagine it is possible a strip rub might be relating to something in light bdsm, but that's guesswork, as I've never heard the term myself.  

It's a cetchy little phrase tho.